I know in this era, this may be a very basic question, but please pardon my lack of tech savvy. I have Cable DSl at home and want to set up a home wireless network to enable me have access to my cable internet wirelessly thorughout the apartment. Ideally, I would also like the wireless signal to be strong throughout the two floors of the house. What equipment do I need? What are the best brands/models? What equipment specs should I ensure I get? How do I ensure the network is secure from outsiders/intruders? How can I give access to others, if I so choose? What should I be wary of? All the computers/laptops in the home have wireless cards. Many thanks!